Upgrading trixbox and getting incoming faxes to work with our Duxburry ISDN cards has always been a chore. Everytime we had to fight with the "install-ZAPHFC" script to get everything working properly.
This time I decided to make the process reproducable by modifying the standard "install-ZAPHFC" script. The script now applies the necessary patches to asterisk and compiles bristuff, junghanns drivers and spandsp so that incoming faxes works with the cologne chipset.
It seems that the patches and source for app_rxfax.c and app_txfax.c as well as apps_Makefile.patch are not longer available on the soft-switch site. Trixbox installs a copy of these though so they are just re-used in the modified script.